I liked the gameplay, and the fact that enemies react physically for the shots, and it slows them down, music was nice and sound as well suited the case.
From technical parts in the second attempt after choosing green gun I spawned with pink one on the level 2 so I guess somethings are llacking there (restart button didn't work actually as well) :P and as at first time I died due to small "cell" enemies surrounded me and I couldnt shoot any at so close distance (melee attack would be nice here) at the second one I just didn't had more ammo drop than a single one on the begining so some tweaks would be needed.
Apart from that pretty nice game, I wasn't expecting just a wave shooter in here, as we start with some kind of "story introduction" and go for walk to make some discovery after a space crash yet after searching every corner I realised that only thing to do is shoot'em all :D