Very fun chemistry based tower defense.

I think this game is great and cool for nerds like me! I have been highly anticipating for this game and seeing it since the idea was made. I am happy to be included in this game. but there are 3 problems which are quite annoying
1. some compounds like NClClCl are too strong especially if attached to a polymer, polymers should have a upgrade limit if they already have one.
2. after the early game, it just becomes auto pilot and grind, maybe add more isotopes or more support towers.
3. unlocking new elements in the table is useless because it makes good elements rarer and might be bad, maybe make it so you can upgrade elements stats in the table, so you could have very strong oxygen, or rewards for unlocking a part of the table!
ps. could you add a research upgrade that enables a fouth element in the shop and one that lets you carry more elements in the shop discount route?
I think this is one of my faourite games, but It just needs a bit of balencing and then it will be perfect! have a good day.