This is great! You kinda fix the difficulty yourself and this feels like a game where you could really think about your routes/placements to get the optimal results. Also very cool that every 5 biscuits some of the placed objects get destroyed.
If you'd want to expand further on this, maybe some actual levels could be added? With some extra blocks/walls so you have to rethink how you will progress to 10 biscuits this time. Just spitballing here.
Great work!