Thanks for the feedback.
The guard on the first click will come for sure in the next update.
Regarding the progression, i built a (semi) procedural system for the density of all elements (including resources) in the board and the size as well, but it needs to be adjusted without any doubt. This will prevent to obtain less resources in upper levels
There's also a plan to include an "resource density" upgrade, so maybe it worth including in the next update if possible
Thanks a lot for the constructive feedback