This would be a nice idle game, but you don't seem to think of it as one, which causes some problems, like the game pausing when you switch tabs, or the bridge on level four. There are also some other annoyances, such as it not being clear which skill is used for certain obstacles(like the beam under the aforementioned bridge - which, by the way, seems to kill the PC even on success - that's just bad design, in my opinion) and sometimes you die apparently without a skillcheck at all(again near the beginning of the fourth level with three consecutive jumps, and several times later in the same level).
Overall, a nice game(albeit with some annoyances) for the first three levels. The fourth level is just... bad. Haven't gotten to fifth level yet and at this rate I'm not sure I will.