Hi thanks for the feedback! :)
There is actually an option to change the key bindings in the settings menu, however the settings menu button is only on the menu screen in this version, which makes it pretty easy to miss and inconvenient to use.
The in-development version has the settings menu on every screen so it's easier to both spot and access. Unfortunately I think it's still going to take me a while before I update this build again, but it will happen at some point~
Thanks!