Legend:
 - todo
 + done
 ~ undecided

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 + Go over existing code
 + Polish enemy behaviour
   + redo spike movement
   + laser charge time, attack radius and tracking behaviour
 + Polish player movement
   + acceleration, deceleration
 + Change units to use SimpleFlags instead of boolean values
 + Add circle shape/collision class
 - new collision system, no unit overlap
 - Fix icon of PND not showing
 - Add combo score tracking (highest multiplier, highest score streak during combo)
 - Fix replays not working between release targets (might be related to new nub movement code)
 - Make the world a better place
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* Small, random stuff
  + Create player character
  + Add more enemies
  + Change UnitLaser eye movement completely to use angleVel instead of setting it directly
  ~ Make UnitLaser not immediately stop eye when targeting the player
  + Draw units with spPrimitive calls instead of sprites
  + change timer to take delta updates instead of real time updates
  - Make UnitBomb evade sides of the level and not get stuck in corners as easily
  + UnitLaser delta timing
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* Event system
  + Create abstract event system
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* Spawning system
  + create a class/definition of a wave
  + create different wave data
  + create event system checking wave spawning criteria
  + create spawn class
  + create region class for single spawns
  + power-ups
  - change to wave spawns only
    - spawn a wave after a fixes amount of time
    - type of wave would be dependant on wave spawning criteria
    - time between waves becomes less in agression mode and more in evasion mode
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* Scoring system
  + assign points to each unit
  + create combo and multiplier calculation
  + add movement/idle point calculation
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* Highscore
  + show highscore after death
  + enable player to enter name
  + keep list of top scores and compare with new score
  + save score to disk
  - encrypt save file
  + state to show scores
  + create data folder
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* Replay
  + basic system
  + look into delta=0 frames (need those or not?)
  + look into smoother playback (talk to Ziz - done talking)
  + create replays folder
  + spit out error when replay not found instead of starting a game
  - encrypt replay files
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+ Menus, navigation
- Help screen / tutorial
+ Pause
- Change to fit different resolutions
  - Change pixel values to percentage of screen region
- Draw menu elements (buttons, icons, etc.)
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* Change render pipeline for final graphics style
  + change units to be drawn with sparrow shapes
  - expose pixel matrix
  - create style class for pixel manipulation
  - create final style of the game (effects, etc.!