Hi! There's no discord for the game yet; this is the best place to comment. You can also send me emails at firstname.lastname@example.org.
The only way I've tested chromebooks is with the html5 version (the "demo" version), which sounds like you've already tried? Buying the game just gets you access to PC/Mac/Linux downloads, so it won't help with chromebooks.
I really do want to make sure the html5 version works on chromebooks... could you describe the lag a little more? Does it start fine and get slower? If you hold down the comma key, you can see the framerate in the lower-left. What rates are you getting?