Going down...
Most of time those games are good. Bossess have patterns you can work out and then beat them without a problem, enemies are manageable, but deeper into forest, more cheap tricks you find, reminding me of nintendo games where guys made you play longer by simply throwing more enemies at you or giving you ridiculous bosses.
Six-legged boss is best example of this. Its not about pattern or anything. To beat it you need to be lucky. Sometimes I knock him out few times in a row, but generally I end missing up window of opportunity again and again and again, which in end results in frustration and ragequit. I expect challenge where my skills are variable, not rulette where i win or lose at random.
Other thing thats irritating is the controls. Since flash devs discovered you can make good controls using arrows + zxc, x was shooting and z jumping. Here its opposite. Lots of times I was taking damage only because I expected X to shoot or Z to jump and game had opposite.