Two or more in one...
This game reminds me of a few different games at once. First, a really old DOS game called Secret Agent. I'm even surprised I remember that name. The other game it reminds me of is Metroid, because of the battery packs to increase the suits energy/shield etc.
Overall great game, the only thing I didn't like was that you had to push down to go through a door, save or refill health, when 99.99999% of other games use up.