I really like how on many levels you can be clever with fast moves right after teleports for instance to finish with 1 or even 2 dark blue stacks remaining (e.g. lvl 23 with 2) Please don't 'bugfix' this away together with the bouncing into the sides that leaves you in between blocks. Regular moving is easy enough; hardmode for the win!
If you want to get rich early on, just fly between the two starting stations, buy utility items for 0.8 price modifier and sell for 1 price modifier. You can go up to Autogun Drones making hundred thousands a trip, but it kind of ruins the game. I would suggest a 20% cut on selling any item compared to buying it. That way it's still good to shop around for stuff you actually need / want to sell, but not just flying around buying and selling unreasonable amounts of utility items. Keep the trading to the low prices trade goods only, where the capacity limit is quickly reached and you can only work with margins on low cash volumes.
TD;LR: add time scores, like in Super Meat Boy!
I think the game when played normally was a bit on the easy side. There's only one or two levels (I recall the one with the multiple layers of ice on the right) that could really count as 'puzzles'. But once I started to go for an optimal fastest route instead of a safe one to achieve an imaginary 'best time' the platform side of the game became really challenging, kind of like in Super Meat Boy. Might be something to explore.
While at first I was skeptical towards the mouse controls, I was happily surprised at how well it works. A couple of levels in and it felt completely natural. Well done.
Hate it when a game has a bug (infinite cash by moving between properties and just buying CDs) and the highscore list is bloated with people who abused it and you cant see if you did a good job without cheating. Spoils the game and I hope the next revision will fix the bug and reset (or create a new) highscore list.
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