Thanks for playing and for the nice comments. I'm sorry to hear about the performance issues.
The game engine we used recently had some updates that help performance on mid/low tier hardware and mobile. We're looking into them, so there may be hope for a version of the game that's more friendly to less powerful hardware. We'll keep the dev log posted.
Glad you enjoyed the game in spite of the lag. If you don't mind, we'd appreciate you emailing us your computer specs to firstname.lastname@example.org. Information like that really helps in developing the game. Thanks!