Cool! I found it a little unintuitive that after each stroke, it reset to the pointer tool. I would've expected to be able to draw more lines without pressing 'X' each time.

Also, as a mathematician, I would love some Unicode support for greek letters and super/sub-scripts. Something similar to https://docs.julialang.org/en/v1/manual/unicode-input/. I tried to just draw the text I wanted but the first point I brought up made this more difficult.

ETA: If you hold 'X' or '7' then it remains in the tool you chose. This makes sense.