Having to put back the tool is a little bit annoying since you don't see where. Either draw an outline where you can put it back, or switch automatically.
You can quickly drop any tool by clicking the right mouse button!
Thank you for the improvement suggestion though! There's really a lot of things that need to be improved (only had 24h free for this game jam). If I decide to develop this into a real game in the future, I'll keep your suggestion in mind!