Nice one! I think you should keep the name "TaivasHippa", even though I don´t know what it means. Sound original...
I couple of things: The fan on my macbook started up like a jetplane, and that means that the computer is working hard. In my experience it´s often because I haven´t put a limit on my fps, so this could be worth looking into. Should be an easy fix.
I think the plan would feel better it it didn´t break so hard when I release the "up" button. I belive you can loosen up the "damper" on the planes velocity a tad.
Finally, I found myself thinking the classic "Come on! I wasn´t even close" a couple of times when I crashed.
It´d be great if you fine tuned the collision detection.
Other than that, nice going! Simple and fun to play, that´s what counts!
You say you´re gonna rewrite it using libgdx. What have you been using now?