The nukes fell below my expectations of how powerful I'd thought they'd be. 400 Nukes for $400,000 isn't near as effective as the Golden Gun for $400,00. The Golden Gun makes getting the Hard Badge easy; it's the saving up part that's tedious and time-consuming. Once you get the Golden Gun, everything else is optional. As long as you know how to aim for the Ammunition refuels, you can just juggle the Turtle all the way. I got 4 Million+ feet doing this, didn't even need the nukes.
Alright, I figured this would help concerning 5-2. You can either save a death on 5-2 by trying to luck out on the physics engine and glide the vehicle over the spikes, or you can beat 5-5 with no deaths.
To beat the final level with no deaths, make sure you have the platform above the blue key spinning and waving around majorly before dropping down to get the blue key. That way, given enough tries, you'll get the chance to jump back on and then finish the level.
Hate the game for reasons other than the fact that it is too hard for you to beat on easy, please.
On a related note, I'd say this game rates about a 4 out of 5. Not a highly original concept, but extremely addicting nevertheless.