great game, but...
really great game. I found a couple of bugs though.
1) Once I got the grey rock smash upgrade, it wouldn't let me smash green rocks.
2) Wen I got the muti-shot upgrade, one of the bullet things went up and the other when down and the middle one stayed in the middle. I don't know if It's supposed to be like this, but if it Isn't then you should try and fix it.
Thats all for the glitches/bugs, now on to what you could improve on.
1)Have different levels for the upgrades and use seashells to buy them. i.e: regular muti-shot would be 60 seashell, and once you buy that, you can upgrade it in different areas such as lock-on, speed, power, and so on.
2)Maybe it can have a shield.
3)This isn't neccesarily a suggestion but i think that the upgrades were way too easy to get. Once I reached the level where it said that you could go back to previous levels for more XP, I finished that level and went back to the first level and got rock smash and was way too easy from there on out.
4)This ties in with number 3, if you make a TentaDrill 2, then make it so that you gain very little or no XP when you smash a rock, because that is what made me reach all the levels so fast.
Well, a word that I would use to sum up this game is AWESOME! I look forward to a possible TentaDrill 2