Woah, those visuals are really neat! It's minimalist, but there's a lot of nice effects and cool feedbacks. It also goes really well with the audio. Congrats for such pleasants visuals!
The game is also really satisfying to play. The progression feels great, it quickly becomes fast paced and challenging, and the swapping mechanics adds a very interesting spiciness. At some point the game became laggy, with egular freezes and audio issues, probably due to a large fire rate (I guess those particles come at a cost :p). Needless to say, things were getting crazy.^^' It was very fun overall!