Meh, nothing too new.
Not all of us use WASD/ZQSD
Why can't devs just add a button remap option? It's not like it's particularly hard. ESDF, IJKL, there are plenty of people who use that stuff instead. Seriously using WASD with your right hand. You need to use your pinky for spacebar and your thumb for shift.
MASSIVE PAIN IN THE ASS.
The game, though, seems to be one of many 2D Dead Space look-alikes (with an abandoned ship being found and the one person charging through it, and buying upgrades with exp etc etc) although fairly competent on its own. I can't actually tell the difference between the pulse rifle and the assault rifle, apart from the fact that the former has 100 more bullets. If there's another difference, it didn't indicate it in the stats, and I didn't notice any myself.
The "levelling up" seems to be entirely useless in the latter portion of the game. After you buy your an expensive unlock, later in the game, money becomes way more scarce than experience, and if you have the money to buy it, you will always have more than enough experience to get it.