Nice concept. I was interested enough to replay it few times :)
Some questions/feedback from me:
- It would be nice to highlight current block e.g. blue color or ideally something colorblind-friendly. You could also rotate the block in "current" slot to reflect it's actual state.
- It would be nice to show entire active block - even part that is outside the main shape.
- When placing a block you could add some juicy animation. To make it more rewarding and also more informative. Sometimes I felt uncertain - if I placed this block or not? Especially if there are few blocks of the same shape in a row.
- Filling shapes is nice, but also pretty boring at the beginning of the stage. For me it's too intimidating to plan every block on level 4+. So I put first blocks as they go and start thinking only when some area is small enough. Maybe you could fill some parts from the beginning? The other idea is to force chained perk for those levels. Chained blocks are more interesting imo.
- Regarding perks - I don't understand why can I select same perk few times. Also don't understand why I should not. Do they give more points? If so, it would be nice to show some multipliers as bonus. Right now I perceive em more like a handicap.
Waiting for the next update :)