Here are the bigger things I noticed, that if you could rework a little, would make the experience more fun. For me at least.
Biggest thing I found, is the amount of enemies during the spaceship game. Maybe I'm mistaken, but it felt like it's always the same, for both long and short distances. When I travelled to a planet right next to me, it ended up being an auto-game-over, since there were just way too many things do dodge. When I tried it again, this time only travelling very far away, the game took longer, but barely had any enemies in it.
The shops and item prices. I just didn't know what's a good price and what's a bad one. Every time, I just ended up being broke, since I either bought and sold everything, or tried to memorize the prices and failed anyways. I would love to see just one more number in the shop: an average price. This way you always know if the deal is good or bad. Maybe I'm just a big noob, but I didn't see into the code, and didn't know what to buy, what do sell, and where to do it.
Otherwise, for me it had a really nice gameplay. I enjoyed the robot talking sh*t when I did something stupid, dodging the crystals and ghosts, and I really felt my computer working through the chunks of code. There might exist some small additions, like adding fuel so you can't just endlessly make money, tax gates, or some other things I thought of while playing, but since it's a jam game, I really liked how it turned out, and you shouldn't be too disappointed, since as you said in the introduction file, there's no violence or fnaf, and with that, neither the potential for an ordinary player to enjoy the game and make it a hit.
We learn from everything we do, and I'm sure you learned tons while making this, but don't forget one thing: enjoy yourself. You did a good job.
Mravec