Thanks for your interest in Puzzle Massive! I am totally open for any help with this project. This doesn't just mean programming help, but also help with documentation, ideas, design, etc..
There is also this helpful guide on How to contribute to an open source project.
Found a bug or 'undocumented feature'? Please create an issue on this project with as much detail as necessary in how to reproduce it if applicable. It might just be specific to the web browser that you are using, so add the name of the browser as well.
I'm always open to new ideas and improvements to Puzzle Massive that would make it more fun and entertaining to the masses. If you would like to discuss it first casually via chat or email that is okay. You can also create a new issue for the new feature and discuss it in the comments section there.
Before diving in to the code with your new feature idea, just give me the heads up at least. And don't forget to ask for help if you get stuck. This application is built on lost llamas (chill) and may have some things that are not obvious.
The reason I built this web application was not directly for monetary reasons. It is more of a fun side project for me and I plan to keep it that way. I hope that someone else can learn from a project like this and be inspired to make something that is awesome, too. Of course running a server to host Puzzle Massive on does cost me some money, I'm fine with that and hope to have that cost covered via sponsors and such.