This is billed as an endless vertical bullet-hell runner, but I didn't notice any bullets to make it a bullet hell, and it definitely has a pretty quick end.
As others have said, having sound effects would add a lot to the experience, and it's not entirely clear what you should be doing for max points - going for speed? Killing all the enemies? Prioritizing pickups? etc
The speed mechanic is really neat, though, and I feel like if the scoring system rewarded speed more, I'd feel more incentivized to optimize around the speed building stuff.
Viewing post in Δx jam comments
Hi Binary Clone, thanks for the feedback. All of the missing issues are on me running out of time for implementation, and I apologize for the inaccurate description (I went to the page to make it more accurate). I'm happy that you enjoyed the speed feature, and I'll try implementing that in either a future game or an updated version of this game.