And the editor seems to get really slow when you have lots of assets. Or is that just my imagination?
The editor gets slower with more assets, but you really need a lot to make it properly slow these days ( I sped it up by a factor of 20x recently). I can optimize it a lot more, but like I said in the jam notes, I'm aiming not to add a lot of features at this point in time. You really don't need a lot of assets in a text only jam.