Stellar game and yeah it looks to ramp up to almost unforgiving levels. Pretty original game at the time. This game could sit nicely in between Tazzmania and Tutankham!
If Robotron: 2084 & Berzerk had a child (& very good too), get very difficult later on (too many Blue Bats, it's like if like they're breeding out-of-control [too many pups them bats delivering]). I also do wish that you should shoot while using the whip too in the game (it make things a little easier, & not getting a cheap death from an enemy too).