Good game, makes me nostalgic for the originals... I think the most needed feature is the actual combat animation... nothing like watching a group of mech's take down a jeep group...
Played a couple upgrade paths and I found leech tank is terrible, BFT Carrier is okay but expect to take hits... and Super Fighter is terrific, great speed, non-stop seekers, and tri-machinegun, good for chasing down the last enemies for the badges...
Couple of hints, to get the carnival trick, you have to keep spinning non-stop from exiting the water to entering it, I can only get this on my 3rd jump, to get wrap around you have to do a circle underwater and come out the same way you were going, to get a reverse, do a half-circle and go out the opposite way. To get a rewind, do a flip one way, then do a flip the opposite way, this can be done for both directions.