The game keeps lagging, it makes it impossible to be able to correctly jump over gaps, as the keys stick and don't respond. I can see many other people are commenting on this too, so I am assured it is not my computer's fault this is happening.
Space being gun upgrade makes going to level 4 with the pistol almost impossible. Sometimes (which is always) I accidentally press space. Please reconsider your decision to use space as gun upgrade.
The main reason this game seems to be hated is because you need to pay $5 to buy the full game. Maybe you should just see how greedy you people are, you want to have the full game yet not pay anything in return. There really is no reason to make this game free, other than for your own selfishness.
It might not be obvious, but the enemies that float in midair and shoot all around are not immune to everything. Kill them with the weapon that is the color of the enemy.
The map turning back into darkness is a bug. I had stopped playing midgame, and then continued again. When I finished the map reverted to when I stopped playing.
Contrary to what developer say, this isn't a good game. Energy replenishes too slowly to have any actual gameplay. Even 1 minute is barely tolerable, what makes you think 5 minutes for one energy (you need lots of them energy) is going to work? 1/5
This game is very misleading. I thought that you actually have to play it backwards, instead of going back 5 minutes every single time. Very disappointing. 2/5