Died 329 times. Honestly, even though it is hard, it is supposed to be, and only a few levels felt unfair or frustrating. Most of the time, it was actually fun to learn the level. It is always great when a game manages to trick you in a clever way.
You also know how juice up a game, but if you are going to stick with these minimalistic visuals, I would recommend adding even more effects like particles, sound cues, or anything else to make it feel even more dynamic. I know how challenging it can be to work with minimalistic visuals, so every little detail helps.
It is very fun, but a bit visually unappealing. Great job!