The game is infinite, one loop (8 stages) is shown in this video.
There are 4 stages each one with a different enemy, and then the same 4 stages but with an added enemy (the bird).
After that the game is not finished: there are another 8 stages exactly the same as before, but the red blocks at the top need 2 hits to fall and create a hole. It doesn't make it more difficult, but instead it becomes really boring and I didn't record that part.
After those additional 8 stages, the game goes back to stage 1.
Played and recorded with openMSX
