Hmmm curious! i will invesigate, do any of my other games display on your browser (they have the same export settings)? If not i can look into a linux version
Sorry it took me a few days to get back to you about this. I started playing Dogman 95 when I first received your reply here, but I got a migraine partway through and had to stop, and I've just now returned to finish it. Anyway, it worked totally fine, so I really wonder what's going on. I'm working on doing system updates right now because I'm well overdo for them, and once they finish I'll try again and see if the problem persists, in case it's due to some obscure regression in something on my system that's since been fixed. (They take a long time to do in Gentoo because you have to compile like 1600 packages from source, at least for a typical desktop/workstation environment. ;^^ )
By the way I'm almost done with updates ;^^ they've been something of a project because I went like three months without running them which is way too long. I think they're basically done now though aside from some housekeeping and things. (I feel obligated to note that Linux on the desktop isn't always this involved to maintain, just Gentoo specifically. ;^^ ) I'll let you know what happens once it's all totally done.
For what it's worth, I ran the browser version via Firefox on Kubuntu and it seems like everything works 100%[1]. I'm satisfied with the four to seven[2] endings I found, anyway. :)
I didn't try the downloadable version with Proton.
[1] I guess you can never technically be sure, if you don't have a baseline for what the full functionality looks like.
[2] Depending on how pedantic you want to be on what defines a "different ending".