Hey thanks for playing and for the feedback!
Indeed on the web it becomes slower and slower as you progress. You can disable the dynamic camera on the settings, but it only helps a little. I'm working on a PC version to make sure the performance is optimal.
I also launched a few updates in the last couple days you might want to check them out.
I recently made a Discord channel, if you want to join I'm posting the updates there. https://discord.gg/XCVVkGhcxr
Keep tuned!