This is actually great. I admire the risk-taking in not having any graphics or music upfront -- I know from past experience people will only play 30 seconds of your game and then move on, so it's an appreciated risk.
My main issues come from the game mostly being one of "guess what the developer is thinking", like I'm playing a Sierra point-and-click adventure game in the 90s. That is, your goal isn't always what it appears to be. At the same time, I guess there's some harsh reality in that -- bug testing isn't necessarily fun, and it requires playtesting over and over again.
I think I was most confused on the level where you have to reset to a null checkpoint, the level where a coin allows you to double jump, and the level where pausing gives you superspeed (this one especially because you then had to collect the coins too and that could be tricky). But other than some minor frustration in figuring out what to do next, I enjoyed this a lot. Great presentation and best game I've played so far even (of like 10).