This is so well made! There's a lot of great polish and attention to detail, you nailed your artstyle and the gameplay ended up being super satisfying (the harpoon bumping you in the opposite direction was my favourite touch). One tiny complaint I have is that it felt like the game didn't really get more difficult as you survived for longer, so if you could survive the initial difficulty level you would kinda just live forever. Maybe increased passive oxygen usage, faster/denser asteroid spawns or something else as time passes would help? Either way I had a great time, the longest I went was 250 subtle flex ;)
