Level 13 seems to be impossible. It's a very simple level, with buttons on one side of the bridge but not on the side with the exit, and apparently nothing else capable of interacting with those features.
Likewise level 14, where the bridge is directly adjacent to the exit, and it isn't possible to jump form the moving platform to the exit... was some mechanic not explained?
No idea how level 13 works.
As others have said, it needs a level select feature with progress saving, and level 13 seems unsolvable or requires a gameplay mechanic that isnt explained (what's with the target that the viruses follow you with?)
Too simple with a few outright braindead puzzles, that is, up until lv 13 where I have tried every possible thing and am pretty sure whatever the target was supposed to do is not functioning.
I have to wonder what the hell is up with all these 4/5 to 5/5 reviews.. Did you people even play the game? The fuck...
this should be a two player game it would make way more sense