Overall great game! My main complaint is that it seems too restrictive on when you can access the new gems, as they cost so much to unlock. I didn't get the 2nd one until Wave 11, and by that point it was too late. Maybe I missed a cheaper one elsewhere? Also would be nice if you could queue up summons in batches as the travel time between "summon 1, move to monitor, move, repeat" is very tedious.
Viewing post in The Lab Defense jam comments
Hmmm... you might have missed the cheaper gem generator, the order in which you (should) enable them is pink, green, red, blue, purple. If you press M you will see them on the map. Also, yes, its also annoying for me that you can only summon one creature at a time, I wanted to change it just before the end of the jam, but realised it could become problematic once someones summons too many creatures... so I just left it at 1 max. Thanks for the feedback though!