[PC][~2008-2012] Top-down tank game with weapon upgrades and a dragon boss in a cave

Platform(s): PC (installed on my computer, not a browser game)

Genre: Action / tank combat (top-down perspective)

Estimated year of release: I'm not sure, but I played it around 13–14 years ago.

Graphics/art style: I remember it being somewhat simple, maybe arcade-style. The camera was directly above the tank (top-down view).

Notable characters: The player controlled a tank. I also remember a dragon boss that appeared in a cave level.

Notable gameplay mechanics:

- You controlled a tank from a top-down perspective.

- There were weapon upgrades.

- There were different maps/levels.

- One level had a cave with a dragon boss.

Other details:

I've been trying to find this game for years and still haven't been able to. This time I decided to ask Reddit for help because even AI couldn't figure it out.