Like a few others here, I've essentially broken the game. I have over ten thousand health, so I'm just not going to die. I could conceivably play for hours, or days, and get millions upon millions of points, and I'd only get hurt very sparingly. Given the number of health bonuses vs. the number of times I get hit, it would take me an extremely long time to die. I've also got an extra 180 seconds on bombs, just because I can, have over 100% on lucky cross chance, and have walking speed maxed. Makes a huge difference.
A few suggestions:
1. Every x levels (say 20 or 30) make more cars appear. Make them come from both directions too, so that sometimes there's overlap.
2. As suggested, maybe speed cars up every so often. Some are already pretty insantly quick, but some lumber soo slowly that I can cross in front of them twice, even after level 100.
3. Add more coin items, and max the percentage of the ones already here. For instance, max 30 seconds of boomb time, max 1000 health, max 50% lucky cross. Afterword, perhaps consider adding:
a) Bonus Spree (10000 coins), when bought will increase your chance for a bonus item by a small percent (max 25% increase)
b) Traffic Jam (25000 coins, one-time purchase), has a small chance to occur, and will cause all cars to stop on the screen for a few seconds
c) Garage Mode (100000 coins, one-time offer); would allow you to hear cars, including car death sounds, from some part of the "learn game sounds" menu once activated. A lot of games do a purchasable sound-test option of sorts.
D) Increased Metabolism (5000 coins per, can be bought up to 30 times); makes health-boost bonuses give you 1-5 more health when obtained (obviously this stacks, and when maxed means you will heal a hell of a lot better
Just a few ideas.
Check out my Manamon text walkthrough at the following link:
https://www.dropbox.com/s/z8ls3rc3f4mkb … n.txt?dl=1