There are lot of Battle City clones in this world. This one is PICO-8 remake made by Shogal. As the version number tells, this game is still in development.

Changes:

– Fixed lot of bugs.
– Normal music and sfx. Some sfx (tanks explosions) are not so good because NES noise channel differs from Pico noise and cannot be made with Pico.
– Different role for shooting buttons: rapid and single.
– Level selection at the start, score screen at the and of each stage.
– Hard mode after stage 70, enemy tanks have all advantages of basic 4 tank types.

http://www.lexaloffle.com/bbs/?tid=28184