Just three things i want to mention: At the beginning of every level, some items are placed at the same position (for example a star and a shield item are rotating at the same position). In the menu, the musik is only coming from the left sound output (that really hurts if you are using headphones). The bar for the Schildenergie is titled with Shield.
The Steering of the glider must be reworked. It is too "jumpy" Either you dont change the pan of the camera, or make the pan changes much smoother. It just hurts the eyes in this setup.
Some text elements overlap in the menues. (Yupp and nein)
On the bottom line, a very simple game for Kids. The grafix are ok, the Menue is quite good. But not mch content. There should be curves, blocked lanes, hills etc. And some kind of goal as mentioned.