I really did like the idea for this. I'm using VS Code in the cloud, and have used Cloud9 before. However, to try it out and get a feel for it the initial ask is too high a barrier. I want to be able to just play with something to get a feel for it before commiting, not configure docker containers or give it full access to a repo. Tbh you need to have an easy way to try it out. That put me off going further, after first signing up with quite a lot of interest. It just felt like too much commitment to me just to try it out. It's easy to address but without it the barrier to starting with your product appears to me to be too high, imho.
SEO-GO