Not liking the model of having to earn scrap AND have to wait for things AND have to use special 'pay for it' tokens too. Its just NOT balanced at all. I don't mind the pay to play model at all, I even DO pay sometimes, but it should be optional, you have built it to be required in your game unless I only want to play 30 minutes a day. Not interested at all.
Make Bob go backwards. Press to switch his direction while he is falling and his movement will change but not his direction. Might happen only on lvl20
neat screen transitions, however it wasn't very entertaining, like not very puzzle like. Just click and go, make a mistake and try again and win. No thinking... :(