Hey ! first of all I'm quite sorry, I'm getting really bad at these sort of games so I couldn't finish it :(
I first tried your jam version, then tried the V2 to actually see what you added in game !
First of all, the game's mecanic about running out of space is nice ! Concept is easily understandable and the game responds quite correctly to it. I liked the graphic chart you used (quite Chtuluish, as someone said in the comments section, I feel like this is indeed the main inspiration), and eventhough you didn't make the music, it suits well the game.
I feel like the game is really hard, but in a cheap way and not in challenging way, I'll explain myself on this :
- The idea of random planets popping when you shoot is quite weird. Sometimes it just pops somewhere and .. voilĂ ! But sometimes it just blocks my path. I read your description and I know this is actually intended, but that's really cheap ! It blocks the player's path and just act as a punishing random feature. I'm pretty sure you can turn this idea into something more interesting and good for the player to play !
- Some monsters, especially at level 2, are really tedious to play against. I'm talking about these laser guys who snipe you from the other side of the screen. To avoid them, I must keep moving, which is okay since it's a shooter, but then a random planet blocks my way and I'm screwed ! Thus dying like shit :D I don't know if other players experienced this, but it felt really random and ungrateful no matter how many times I tried.
These are my main two complaints. You made a good job creating this game in 3 days, I also love how the game "flows", which is why this idea of planets popping up really bores me. The game is quick, tense, and I really like the way you designed the pace. Good job !!!