Others have already mentioned this but the game looks a lot like Post Void which is excellent.
Speaking about the presentation, some enemies turn purple after death. I imagine this is a graphical bug. Also, more sound effects are needed.
I think chests and the like should open up a little bit sooner because the text is too close to the player to read as it is. Pickups also need some kind of effect to make them stand out more, perhaps they could have a little animation, emit particles or something.
It would also be nice to have an indicator that points to the exit if all enemies have been defeated. In Nuclear Throne the exit simply appears next to the player so this isn't a concern on that game but that isn't the case here since the exit seems to be generated along with the rest of the level.
In terms of controls I would like a quick-swap key to change weapons rather than pressing the corresponding number. That seems like too much when you can only hold 2 weapons anyways. Also, it would be nice to have a hold L-mouse to auto-fire because Nuclear Throne's pistol almost gave me carpal tunnel.
The last issue is difficult to pinpoint but I believe the game needs a stronger incentive to kill enemies and go fast. In Nuclear Throne you need to kill them and they also reward you with experience, I'm not saying that's the right approach here but as it stands there's little reason to fight most enemies except maybe bosses since they are so dangerous and drop stuff.