4 * Bug: have to click lights multiple times to turn them back on after the power has died
5 * Allow denser turnip spacing
6 * Allow going down to zero seeds by buying lights if a turnip is planted
7 * Maybe make the mould weaker at the start
8 * Different prices for different lights
9 * Different power usage for different lights
10 * Calculate both from # of colours, speed, beam width, etc.?
11 * Display power usage when lights are bought
12 * Maybe also display information next to existing lights (on click?)
13 * Generally balance the levels better and add more levels
14 * Graphical level selection with screenshots
15 * Fast forward button for night-time (calculate more steps between redraws; play sounds sped up and with higher pitch)
22 * Light colour selection
23 * All lights multicolour
24 * Light direction configuration
26 * Sunrise transition screen
27 * Lose condition (no turnips and no seeds)
28 * 'End the Day' button
31 * Battery and light power consts
32 * Mould power increases to prevent farming
33 * Night remaining counter
35 * Seralize light on / off and colour selection state across day / night transition
39 * Image for pulsating lamp
40 * Add placement error sounds
41 * Add sound for battery going dead