I think the most important upgrade in the shop is the realising that it is possible to jump. If I would have gotten that at the start I would have completed it way faster.
I understand that it is against the principles of the game to be able to kill the guards. But wouldn't it be absolutely awesome if you could set the guards up so they would kill each other in friendly fire?
Too bad you can't write complicated songs in this. For instance, if you select the key G major, you can only use notes of that key. So if you have a bridge thingy with some other notes in it, you can't write them in there.
This game has got great artwork in it. I'm sure they put a lot of thought in the sounds and the music as well. I also really like the fact that it has a grappling hook in it. Kind of reminds me of Just Cause :).
You should be able to crush through airplanes from below if you have enough speed, like in the indestructotank series. I hate it when I jump on an oil truck and all of my velocity gets wasted because I immediately bump into a light airplane of some kind.
I think you should not see this as a game you want to play for more than 30 mins straight. I would rather look at it as a gadget or an application you want to think about while biking home or waiting for the bus. It may take weeks to complete it like this, but i feel like this is the way we are supposed to do it.
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