Completed BIOTA.
One unexpected feature from that kind of a game is that you can save on any screen, if there are no enemies or hazards on it. This especially helps in some platforming episodes.
There are episodes in mech and submarine. A homage to Metal Slug, maybe? Those aren’t very good, though. And the worst one is the pre-final episode, where you need to rappel down while shooting enemies. I was about to drop the game at that point, because of how random that piece is. Completed it only because I got lucky.
The final fight is Star Fox style. If I wanted to play Star Fox, I’d play Star Fox, not an arcade shooter, don’t you think?
So despite the attempts at retro-vibes and introducing a new mechanic in each zone (sliding, lasers, etc), I can’t say I enjoyed it much. If it wasn’t for the save feature, I would have dropped it somewhere in the middle.