Thanks you very much for honest feedback! This confirms some of my suspicions and gives me several things to double check.
Regarding Controls: have you tried using hotkeys (1-3) to select crabs? This is an option one of my friends proposed, and I feel like it makes controls much better, but it's not explained enough in the game and is easy to miss. I initially only had drag'n'drop on crabs themselves. Judging by what you mentioned, you happend to use the least comfortable control method there is (using info widgets to start a command) :) I should really work on making other options move obvious.
Regarding difficulty: have you happened upon an encounter with big sand-colored dudes? I'm curious because several people mentioned to me they are a significant damage spike, and since you found the game easy and lacking danger - it would be useful for me to rebalance things