I'm surprised at the mixed reviews. Reading through them, my guess is that Inner Space requires a controller and a strong stomach. If you don't get sick easily from games and you like the idea of flying for exploration's sake, you'll likely enjoy this game.

I think the sheer number of collectibles is unnecessary, but the core gameplay is fun and it feels good to improve your skills. Took me about 4 hours, ran perfect on Steam Deck, looked beautiful and unique, really scratched an itch for a non-combat, not-on-rails flight game.