Problem with final boss

[wesabr]

I am trying to beat the final boss, but there seems to be a glitch :(

My strategy is to create a dummy on the other side of the boss with ent_create2 and then shoot it with my laser.
It's working several times, but at about half health the boss always just charges through the walls / floor / ceiling and then it's gone completely off the map.
When I zoom out with the camera function, the boss is nowhere to be seen, but the battle music is still playing. I can't go back to the portal either, and I tried to see if I can pass through the right bottom side, but there are invisible walls.

I spent quite a lot of time on the first 2 star battles, so I would really like to finish the game. Is there any way to fix this problem?

[Spiderwork]

Try to place dummy over the lava in the right corner... Then the boss will fly into it and will be destroyed.

[wesabr]

Thanks, that worked :)
Now I'm trying to take on the actual last boss, which is really hard. Is there a specific strategy or is it really just down to getting shots in when you can?