Visuals are really nice. I like the minimalistic stars in the background and the space travel scene. Planet graphics are cool as well. Quite like the animations, especially when you exit to the surface. Tunnelling effect is well done.
sfx and music are nice but sometimes feel like they don't mesh well, since some sfx are chiptune, some are realistic, and the music is hidef as well.
Story is simple and cute and adds to the game.
Gameplay takes a bit to get used to. I ended up losing a lot of early levels by pressing the wrong button too soon. Also there's a bug where if you press to move right before a tutorial dialog appears you will immediately go to the surface and lose as soon as the dialog disappears. The landing sequence on each planet is nice the first time but gets annoying after you die and have to restart and just want to start playing the game. Once you get used to it it is fun to figure out an optimal strategy for each planet; also appreciate the dotted line that appears as you change height, definitely makes it more intuitive to play.
One thing I'd suggest is making it more clear how much integrity a planet has. I like the mechanic as it adds strategy but every planet has the same size bar and you have no idea how fast it will go down until you start playing, requiring you to kind of trial and error levels the first time.
Overall pretty solid entry, I'd say it does best in terms of polish and visuals but needs more on the engagement side