Very good idle game!
Only very few remarks :)
-no indication of when it saves. Refreshing the newgrounds page may make you lose a minute or so of progress. How can I know for sure it'll remember I really upgraded that monster before I turn off my PC?
-no way to export savegame to a local text file or clipboard, sorry but that is essential functionality for clickers ;p
-"multiple buy" button is not ideally placed. Right above a scrollbar, so if you use the scrollbar to scroll up and release mouse above the button it gets clicked unnoticed
-the multiple buy button is annoying anyway due to its amount of modes to toggle through - a separate small button for each multiplier would be handier. I only use "1" or "max" by the way