Now that the pressure for the jam is off, I can take things slowly. Improving explosions was never a priority, but now I can take my time making them beautiful. I tried to make screenshots but it’s much better in movement. So I’ll post the 2 versions of the game (Unity web player versions):
Old explosions vs New explosions

They can still use more work though.
And here is the entry

Now they have reflections and the light vanishes slowly