Here is a compilation of various Tunneler clones & remakes I’ve encountered.
First, here’s the original Tunneler for comparison:
Tunneler for the iPad by Andrej Tetak (2013): This looks like a pixel-perfect port to the iPad!
GM Tunneler by Erik Leppen (2007): Windows. Adds: “configurable map settings (including a randomize option), custom player colors, and the placing of turrets at the cost of some energy.”
Pyros’s Mobile Miners by Avishay Yagoda (2000): DOS. Includes lots of additional weapons and options.
TunnelerDS by MagNet (2007): Nintendo DS
Tunnelers by Floating Minds (2010): Windows. Network play. 3D bird’s-eye view. Many options, weapons, and arena options.
Liero by Joosa Riekkinen & Erik Lindroos (1999): Windows (before Windows 7). While not truly a remake, this game has a look and feel that definitely seems inspired by Tunneler. Also check out OpenLieroX.
Tunneler2 by Allan Lavell (2011): Written in Python. Network play. [no good screenshot available]