Main updates
*5 levels:
1. First Step
2. Variation
3. Boom！
4. Sprint
5. Defend
*3 types of levels:
1. Score-based levels (need to reach a certain score to pass)
2. Time-based levels (need to survive for a amount of time to pass)
3. Sprint levels (need to drive the tank to the designated position to pass)
Notes:
Some of the turrets in certain levels been adjusted
Other:
*Fixed some bugs
*Added some bugs