Again, I understand the mechanics of the game. I just feel like the way the game communicates them (not just in the About screen, but in the gameplay itself) is rather unintuitive. The coin explanation in the About screen is not sufficient, because it isn't explained that coins are converted to health AFTER you take damage. That's putting aside that game systems this basic should be self-explanatory and not require explanation in the first place.
Saying "To win, you need to finish all five levels with 1 or 2 hearts" can easily be misinterpreted because you specifically mention "all five levels," implying that this restriction applies to every level in the game. A wording like "To win, you must complete the game with 1 or 2 hearts left" would be better, although still limited in usefulness because on your first run you don't know which level is last.
None of this was a huge deal, but it made the experience a lot rougher than it needed to be for such a simple game.