Cool game. Very difficult! You could put a small obstacle around the first enemies that block you from falling all the way back to the start, so you can repeat the first wall jumping sequence more quickly. This would help learn the mechanics a lot I think. Very well made game tho.
Because the game relies heavily on memorization and fast reflexes, I think it would benefit from shorter levels with more missiles and targets in them. Or other way to say it, faster tempo (like guitar hero or osu!). But nice game and the 2 button idea is well implemented.