A very interesting game! It could do with a few improvements here and there, however, to bring out its full potential. But I really enjoyed playing it :)
I'm taking the liberty of giving you some very detailed feedback, since you invited me to do so in a comment on my game ^^.
Essentially, I found that you didn't communicate enough with us about how the game works. For example, it took me a long time to understand how teleportation worked. I'd press space, and I'd see that I could teleport somewhere, but I couldn't figure out how to choose where I teleported to. So I clicked and teleported by default wherever I could. It was only later that I realized that by moving my mouse cursor, I could influence my teleport destination (it took me a while to figure this out, as my mouse was always positioned on the planet I was aiming for). Then it took me a while to figure out that my teleportation distance was linked to the second gauge on the left of the screen. In short, all this would have deserved a little explanation, whether on the game page, in a “How to play” screen in your game, or even, ideally, via a little interactive tutorial (but this often takes time to do).
Once I understood how teleportation worked, I suddenly became a much better player, was able to strategize, and enjoyed the game a lot more.
Then, despite your little explanation on the page about how our orbit around the planet works, I found it difficult to get to grips with this game mechanic. I used it, a little. But often I'd end up with a gigantic or very small orbit, and I couldn't really go back. In short, I'd say it wasn't very intuitive (at least for me). But I do applaud the idea, which is very interesting, and I can imagine that implementing such a game mechanic can't be easy at all!
(I also had the impression that the orbit broke when I collided with the two “pillars” of the ice planet).
Oh by the way, I loved the atmosphere of the ice planet, both the music and the design!
Finally, and especially for a game jam, it's particularly frustrating to make the player restart the game from the beginning when they've lost. Sometimes this choice is justified: for example, if the games are procedurally generated and don't resemble each other, or if the player obtains malus and bonuses along the way and it's essential to the gameplay to start again from the beginning. But in your case, you start a boss fight with all your life back. So it's a bit frustrating to die facing the Sun and have to start all over again from the beginning to defeat that one boss. Also, when you're making a game for a game jam, you have to think about the fact that not everyone is necessarily super-strong in the style of game you've created, and that not everyone tries out a lot of games and will necessarily have the patience to work hard on yours. In your case, it would have been possible to make the player start again from the last boss he lost to, or even to suggest in the menu to start from such and such a boss.
In short, all my feedback is in fact small but important details. Your game is really good! It's just missing a few things for us to fully enjoy it :D
Anyway, congratulations on creating such a lovely game, and on reaching the end of this game jam!
I wish you all the best for the future :D