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RD Mars is an unusual beast, being part adventure/puzzle game, part visual novel, and part 2D top down shooter. And this depth of game design would be welcome, if it was matched with high quality technical implementation... which RD Mars is not. It seems like a lot of effort was wasted putting a frankly immaculate cosmetic routine onto a dead pig.
From a technical perspective, the game doesn't meet basic minimum requirements that most PC gamers expect as standard.
A choice was made to use obsolete, decades old retro pixel "art" as a substitute for contemporary PC graphics. It's unclear if this is due to lack of budget or talent, regardless, the overall visual quality of the game is extremely low as a result.
There's no options to change the resolution for the game or customise the graphics settings. There's no way for gamers to ensure this is running at the native resolution of their displays... there's no guarantee this game will look right on any PC as a result of this hamfisted design decision. There's no way for gamers to try improve the low quality graphics.
The implementation here is of such poor quality, the developer couldn't work out how to make the game display in fullscreen, it only runs in a window.
The controls can't be customised, which will be an annoyance for many, but it can also render the game unplayable for differently-abled gamers.
Some of the defects in the game can be attributed to the choice of using the GameMaker Studio construction kit/toolset. This is a very poor quality toolset favoured by amateur developers as it's cheap and requires little in the way of development skill, but unfortunately has very limited capabilities. Just as you can't make a silk purse out of a sows ear, you can't make a great video game if you use a terrible engine. GameMaker Studio is most commonly used to make retro pixel shovelware and cash grabs.
A strong argument can be made that construction kits like GameMaker Studio should never be used to make games for profit, as the "developer", Tye Abbott has done here. These construction kits are intended to teach people some of the basic principles of game development, and to make small demos to pass around with friends. They're not intended to replace to actual work of real, professional game developers. So it's inappropriate when amateurs try to use these for profit, without any actual, real game development effort taking place. This doesn't result in products that have any real meaningful value for gamers.
These technical defects push this game below acceptable standards for any modern PC game.
The poor quality of this game is reflected by how many people spent time with it. At the time of this review, SteamDB shows the game all-time peak player count was only ONE player. That's right, only one person ever played this at a time. When I played this for the purposes of reviewing it, I equalled the peak player count for the game. OUCH. The only player activity occurs once or twice a month, presumably someone loading it up to see what it is then quickly uninstalling it. Considering there's over 120 million gamers on Steam and well over 50,000 games for gamers to choose from (over 9,000 completely free titles), the overwhelming lack of interest in this low quality game is to be expected.
RD Mars has the laughable, eye-watering price of around $5 USD (doesn't even have fullscreen... yikes), it's not worth it given the defects and shortcomings with the product, especially considering the sheer number of completely free, much higher quality games on Steam.