Looking very good, but there are a few things that I think could be improved:
(I hope that Kojote reads this)
1. (and most important:) the jumping sound effect! - I would recommend to use one similar to the C64 version, the current one from the Amiga version is just awful.
Here's a video of the C64 version:
2. 8 stages using one and the same graphical theme is just waaaay too much. Why not having an easy/normal/hard mode with a different number of stages ?
3. Grey, dark green and... brown ? o_O ...where's the purple from the earlier beta screenshots ? Why would one choose these uninspired dark colors ?
4. I really like the music but two themes + boss track for 8 stages gets old VERY quickly. Again, I propose to offer easy/normal/hard modes with less stages.
Also, where is the tune from the preview/trailer video ?
5. I see way too many trees... - I liked the pipes from the original and the earlier betas. Where are they ?
Insane homebrew collector.