Hey Artur! Yes we wanted to upload an HTML5 build, but we ran out of time. Anyway, we used FMOD, which is really laggy on web builds...
We know people dont like downloadable versions, but it is what we managed to do...
About the Linux thing, thank you for the feedback, really did not think that much through. I will upload a linux version when the jam ends, and will take that into account for future games. I guess in gamedev community there are more linux users than I thought ;P