Thanks, I think there is some tweaking left to do. Even I miss the action window sometimes, even though I have the feeling I am on beat ^^

Thanks for playing! Maybe it wasn't you missing the beat, but audio latency from the browser or the visuals which can be a bit misleading too. Personally, it works best for me if I concentrate on the music only. If I have time, I will change the bottom action bar into something more helpful for a rythm game.

Yes, the controls need some getting used to - how far did you make it?

Oh, alright, haha :D So, at it's heart the game is a roguelike: at each level, you have to find the downward stairs to progress to the next floor, until you finished the game. However,  the game also borrows elements from rythm games and is heavily inspired by Crypt of the Necrodancer. And since it is an entry for the 1-Button Jam, there is yet another twist to it: instead of being able to move in any direction you want, the current beat determines the action you will execute. On an odd beat (1 and 3), your character will move forward (or attack, if there is an enemy in front of him). But on even beats (2 and 4), your character will turn right. The action bar in the middle bottom of the screen shows the action which will be executed. But to be honest, I find the audio more helpful than the visual for finding the right beat. Also, there might be some audio latency problem if you are playing in the browser. Please let me know, if this explanation helped!