The trail particles look like they're bullets, I'd have liked a line trail instead. Other than that, just the infinite gameplay possibility needs to be balanced. I mean just take this example -> I wanted to die to see the leaderboard screen, so I just started running into enemies. Now it's quicker to take their bullets, but I realized that like 5 hits later. But it took around 30 seconds for 6 enemies to show up and kill me. The screen was left blank for a decent amount of time, very undesirable. But gameplay wise it's good, and fits the theme well.