Very laggy and I have a beastly machine.
UI elements just have a delay after use and it's a full freeze of game so it just makes it feel very amateur and unpolished.
The aesthetics and game design are great though and I am still playing it idly. (just leaving it open and repeatedly running same levels until I can upgrade enough to do much higher levels. Rinse repeat and enjoy the way the game keeps adding more stuff like more abilities/spells/blueprints/etc.
Please fix the lag.