Controls were really responsive and tight. I love the minimalistic look of the game as well! I had the same issue as Kisame on Level 5 where I softlocked my progress by grabbing a key and then dying after pressing the switch.
Thank you so much! Yeah.. sorry about that. I never came across that in testing. You can restart the level from the pause menu. The pause menu is opened with ESC, but that is the same key as exit fullscreen, so you have to first exit fullscreen, click back into the game and then press ESC. My bad XD.