Thanks for playing. There is already a lot of mechanics in the game ready to burst out. I ran out of time to make the levels and I am sitting on my hands until the Judges are done. Half of the blocks are not currently in leveles you can play (but can be used in the level designer) and with everything in play I am pretty confident it would feel less derivative. It is a shame, but I am pretty sure making new levels breaches Polish!
In terms of the Theme it's not particularly deep. Once each Cube is used it can't be used again. Also things like the bouncers can only be used once. It might not be very romantic but it is there.