It's a great lifestyle/idle game for the Pocket Store, I believe (if ever). Very ashorthike-y, but it is good!
The running speed after ?2nd? upgrade but before ?4th? should be fixed, it's very hard to collide with green nuts now (I'm playing both GBC and PS3 ds3).
Also, dashing as down+jump killed platform-falling with down+jump, that's an issue too - well, after coupla days, I think it is OK as far as the jump is upgraded enough, but it was irritating in the playthrough. They also clash with an off-wall jump almost in every combination.