Thanks :)
Yea, I chose to go with a very simple concept for this jam.
For one, this is my first finished 3d game (with 2d gameplay though), so there were lots of things I still had to learn and I needed to plan in enough time for that.
Also, I participated in 2 GMTK game jams in the past and in both, i had vague puzzle idea in mind that didnt work out in the end. One was so badly working that i couldnt even submit it. So I chose to go for something that works for sure for my first jam here :) (Thats why i'm very impressed when I see puzzle games like yours in such a short jam that work so well from a game design perspective!)
But yea, the gameplay could be expanded quite a lot, I decided against being able to shoot, though that would also be fun. And I had an entire fourth level inside the alien spaceship with cool new enemies prototyped but had no time to actually make it :(
And yes, I will be back for more jams if I find the time!