Thanks for playing!
Can You explain what you mean by first issue? Is it the 'Quit' button or the fact that it's all static with just a couple of buttons? If former, it was kind of intended to work on PC version but this way on web it just closes weirdly but at least it has this fun option. If it is latter, animations and other kinds of effects were really out of scope for my knowledge, maybe one day I'll implement something similar.
The information about where you need to be in order for blocks to move was left out intentionally because I didn't know how to balance the game so I decided to let the player explore how things work.
The effect of E wasn't intended to be clear. There are actually two effects: one is a downside and one is an upside. One helps, one doesn't help. But theoretically, even the one that doesn't help can help. It was again left out for a player to explore.
E can be used twice in one round: start and stop. That is the purpose of stopping the blocks, to go and hide behind them while time is stopped :)